Need GT40 Vaccum line help

[bess-n-betty]

:damnit:
Have a 88GT. Put a new crate motor in it and also went to a GT40 upper/lower intake.Having intermitten problems with it. Idle goes 1000 up to 1500/1800 back and forth then dies.Heard it may be vaccum related. Not sure if we got the hose's correct from the stock motor to the GT 40.Any info would be great .
Thanks
Toby

 

[Skoobie]

Yeah I had the same problem with my GT40 setup. Check all the vac lines, check the capped off vac ports, check the IAC. If its none of these check your intake gaskets. I had a break in mine that turned out to be 70% of the problem

 

[jrichker]

The vacuum lines you need are 1 small line for fuel pressure regulator, 1 small line for A/C, 1 small line for EGR and another small line for the smog pump. One big line at the back goes to the vacuum tree for the power brake & A/C. Another big line connects to the PVC valve. The other big line goes out the front for the carbon canister. In a pinch, one of the small lines can connect to the spare port on the vacuum tree.

See http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg for more help.